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Depth-extended integral imaging system based on a birefringence lens array providing polarization switchable focal
Chan-Kyu Park1, Sang-Shin Lee, Yong-Seok Hwang
1Department of Electronic Engineering, Kwangwoon University 447-1 Wolgye-Dong, Nowon-Gu, Seoul 139-701, Republic of Korea.
Optics Express
|April 8, 2010
Summary
This study presents an integral imaging system using a birefringence lens array (BLA) to extend depth of field by switching focal length with light polarization. The system successfully reconstructed 3D images with extended depth of field without resolution loss.
Area of Science:
- Optics and Photonics
- Imaging Systems
- Materials Science
Background:
- Extended depth of field is crucial for high-quality imaging systems.
- Traditional methods often involve complex mechanical adjustments or multiple lenses.
- Liquid crystal (LC) based optical components offer tunable properties.
Purpose of the Study:
- To propose and demonstrate an integral imaging system with an extended depth of field.
- To utilize a birefringence lens array (BLA) with polarization-controlled focal length switching.
- To reconstruct real and virtual 3D images with high resolution.
Main Methods:
- Fabrication of two distinct liquid crystal (LC) embedded birefringence lens arrays (BLA I and BLA II).
- Utilizing ZLI-4119 and E-7 LC materials injected between lens substrates and ITO glass.
- Switching focal lengths (680 mm and -29 mm) by controlling light polarization.
Main Results:
- Demonstrated successful switching of focal length using light polarization.
- Achieved efficient reconstruction of real and virtual 3D images at z=1300 mm and z=-30 mm.
- Maintained image resolution without significant degradation across the extended depth of field.
Conclusions:
- The proposed birefringence lens array system effectively enables extended depth of field in integral imaging.
- Polarization-controlled focal length switching is a viable method for enhancing imaging capabilities.
- The system shows promise for applications requiring high-resolution 3D imaging over a large depth range.
